The operators An have still better smoothness properties.
The new X is no more continuous, although it still has norm 1.
An ingenious alternative proof, shorter but still complicated, can be found in [MR].
This is of course still an implicit characterization of V, since......
It seems that the solution of Problem 1 is still out of reach.
Go to List of words starting with:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
Y
Z